PreviousBlockInList  290 magick/memory.c   PreviousBlockInList(block)=previous;
PreviousBlockInList  297 magick/memory.c     PreviousBlockInList(next)=block;
PreviousBlockInList  307 magick/memory.c   previous=PreviousBlockInList(block);
PreviousBlockInList  313 magick/memory.c     PreviousBlockInList(next)=previous;